treetable loadBranch and filtering

I have a treetable, where 1st and 2nd levels are initially loaded, and 3rd and 4th levels are loaded by loadBranch() method. I need to use filters in this treetable and filters should work for 1st and 2nd levels only, so no need in server side filtering. How can this be implemented?

Hello,
Please, check this snippet: https://snippet.webix.com/e4qsgxb6
There you can see that filter works with 1st and 2nd levels only, until you open branches which are uploaded dynamically